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GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware

GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware. Secondary Storage. Secondary Storage. Nonvolatile storage that is external to the main memory Used for: Storage of large amounts of data Permanent or long-term storage Backups Hardware is input/output (I/O) device.

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GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware

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  1. GRAP 3175Computer Applications for DraftingUnit IIComputer Hardware

  2. Secondary Storage

  3. Secondary Storage • Nonvolatile storage that is external to the main memory • Used for: • Storage of large amounts of data • Permanent or long-term storage • Backups • Hardware is input/output (I/O) device

  4. Three Secondary Storage Media • Magnetic tape • Magnetic disks • Optical technology

  5. Three Main Characteristics • How much storage do you need? • Totals bytes • Density • How fast do you need it? • Data access time -- milliseconds • Data transfer rate -- megabytes per minute • How much will it cost? • Fixed cost • Cost per megabyte

  6. Local On-line Near-on-line Backup Archival Distribution Hard Disk Server-based magnetic & optical drives Optical jukeboxes & tape changers Tape drives & changers Tape drives & optical disk Floppy disks, recordable CR-ROMS, & magnetic tape Type of Storage Device

  7. Evaluation Criteria • Throughput (speed) -- transfer rate • Access time (delay) • Capacity • Drive cost • Media cost • Archival life

  8. On-line Near-on-line Backup Archival Distribution High throughput, fast access time & high capacity Very high capacity, low media cost, & long archival life High capacity & low drive cost Low media cost & long archival life High capacity & low media cost Type of Storage Criteria

  9. Magnetic Tape • 1/4”, 1/2”, 4mm, 8mm, or VHS • Tape drive (I/O) • Sequential Storage • Inexpensive -- backup storage

  10. Reel-to-reel Tape • 21MB - 170MB • Old technology -- slower access

  11. Cassette Tape • QIC -- Quarter inch cartridge (1/4”) • 2.5GB to 4GB • DAT -- Digital audio tape (4mm) • 20GB • DDS-3 -- Digital data storage (4mm) • 12GB/24GB

  12. Cartridge Tape • DTF -- Digital tape format (1/2”) • 42GB • DLT -- Digital linear tape (1/2”) • 35GB/70GB • AIT -- Advanced Intelligent (8mm) • 25GB • VHS -- Video tape • SD1 -- 19mm • 100GB

  13. Magnetic Disk • Direct access • Ability to hold more data in a smaller space • Faster data access speeds

  14. Floppy Disk • 8’, 5 1/4”, & 3 1/2” • I/O device -- floppy disk drive

  15. 5 1/4 DSDD 5 1/4 DSHD 3 1/2 DSDD 3 1/2 DSHD DSED Floptical SuperDisk 360k 1.2MB 720k 1.44MB 4MB 21MB 120MB Floppy Disk CapacitiesDOS

  16. 3 1/2 DSDD 3 1/2 DSHD Floptical SuperDisk 800k 1.4MB 21MB 120MB Floppy Disk CapacitiesMAC

  17. Hard Disk • I/O device -- hard disk drive • Read/write head

  18. Fixed Disk • 1 - 5.25 • Interfaces • IDE (EIDE) - Integrated Drive Electronics • Only daisy chain 2 drives • up to 27 GB • ULTRA IDE, EIDE • SCSI - Small Computer Systems Interface • Daisy up to 6 devices • up to 73 GB • SCSI-2, SCSI Ultra2/Wide

  19. IOMEGA ZIP JAZ JAZ 2 Parallel or SCSI SPARQ QUEST 100MB 250MB 1GB 2GB 4.7GB Removable Cartridge

  20. Optical Technology • Overview • Large storage capacity • removable • not magnetic • Optical Disk • Size • Uses • data, video, audio

  21. CD-ROM • CD-ROM -- Compact Disk, Read-only Memory • 650MB • CD-R • CD-RW • 40x

  22. DVD • DVD -- Digital Videodisk • up to 10GB • DVD-RAM • up to 5.25GB

  23. WORM • WORM -- Write Once, Read Many • 200GB

  24. Erasable Drive • Magneto-Optical • 3.5 MO -- 1.3GB • 5.25 MO -- 5.2GB

  25. Others • Optical Card • Optical Tape

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